Document Type and Number:
Japanese Patent JPS5646202
Kind Code:
B2
Abstract:
A method of purifying triaryl phosphate to be used as electrical insulating oil, comprising a first step of washing the phosphate with the aqueous solution of alkali, a second step of diluting the phosphate with aromatic insulating oil, a third step of treating the diluted phosphate with acid clay in an atmosphere of dry gas so that the acid clay adsorbs the impurities in the phosphate and a fourth step of treating the phosphate under reduced pressure for removal of any remaining impurities therefrom.
Application Number:
JP5922977A
Publication Date:
October 31, 1981
Filing Date:
May 20, 1977
Export Citation:
International Classes:
C10G53/12; C07F9/02; C07F9/12; C10M105/74; H01B3/20; H01G4/22; C10N40/14; C10N80/00